Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Default Texture Width
PREF_PM_WIDTH
Parameter: Default Texture Height
PREF_PM_HEIGHT
Parameter: Default Channel
PREF_PM_CHANNEL
Parameter: Photoshop Path
PREF_PM_PSPATH
Parameter: Work Path
PREF_PM_WPATH
Parameter: Mode
PREF_PM_MODE